I will have a run of 1" schedule 40 from a sub panel to an outdoor location where I would like to install both an outlet and a light fixture. Must I pull two circuits? May I in that size of conduit?
Some additional notes.
I am putting up some motion-activated (and daylight-deactivated) security lights. The conduit to the fixture just so happens to pass close to a deck that, currently has a non-GFCI outlet and which is probably wired without a ground. So I want to decommission that outlet (covering with a plate, of course) and put a new, grounded, outlet. The maximum I'd have on one circuit here would be three LED security fixtures and one outlet. I have plenty of room in my brand new subpanel for circuits, so it if were code, I'd certainly do this as two circuits. I'm really not that concerned about a fault in one disabling the other until I can repair it.
The conduit isn't in place at all yet; I specified 1" because I used that to have extra room in the underground conduits recently installed, and I dind't think about it very hard. If something smaller meets requirements for fill for two circuits, I'll be happy to buy smaller schedule 40. I'd rather not go down the MWBC path.
I absolutely know to use individual wires, not NM or something, having been taught that by the inspector on a prior effort.